Subject covered in a madrasa (5)

I believe the answer is:

islam

(Other definitions for islam that I've seen before include "Religion based on teachings of Muhammad" , "Koran its scripture" , "Belief" , "Mails to great eastern religion" , "Major world religion" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.